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Performance evaluation of an effluent treatment plant for a pulp & paper millhttp://nopr.niscair.res.in/handle/123456789/3223
Title: Performance evaluation of an effluent treatment plant for a pulp & paper mill
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<br/>Authors: Mishra, Deepti; Khan, Mohd Akram; Mudgal, Manish; Padmakaran, Prabha; Chakradhar, B
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<br/>Abstract: Monitoring and performance evaluation studies were carried out for an effluent treatment plant of a pulp and paper mill located in central part of India. The paper presents the characteristics of wastewater from different units of effluent treatment plant (ETP). Effluent samples from different locations of ETP area including combined treated effluent and river water samples were collected at monthly interval and analyzed for detailed physico-chemical and biological parameters for a period of ten months. The pH of raw as well as treated effluent indicates its neutral nature. The BOD, COD and suspended solids in treated effluents were reduced significantly, whereas very small reduction was observed in dissolved solids and chlorides in treated effluents in comparison to raw effluents. Most of the parameters of combined effluent were well within the permissible limits of Central Pollution Control Board, India. Recommendations were given to increase the efficiency of ETP.
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<br/>Page(s): 79-83Simple and facile methods for the determination of carvedilol in pharmaceuticalshttp://nopr.niscair.res.in/handle/123456789/3222
Title: Simple and facile methods for the determination of carvedilol in pharmaceuticals
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<br/>Authors: Sreevidya, T V; Narayana, B
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<br/>Abstract: Simple and sensitive methods for the determination of carvedilol (CAR) are described. The methods are based on the reaction of CAR with ninhydrin (NIN) in basic medium to form coloured iminium salt having absorption maximum at
402 nm and also with acetaldehyde (AA) in presence of sodium nitroprusside in basic medium to form coloured product having absorption maximum at 558 nm. The calibration graphs are found to be linear over 0.2 - 1.2 and 0.6 - 2.0 µg mL⁻¹ with molar absorptivity values of 2.571 × 10⁴ and 1.617 × 10⁴ L mol⁻¹ cm⁻¹ for CAR-NIN and CAR-AA respectively. The optimum reaction condition and other analytical parameters were evaluated. The statistical evaluations of the methods were examined by determining intra-day and inter-day precision. The methods were successfully applied to the assay of CAR in tablet formulations. The accuracy and reliability of the methods were further ascertained by parallel determination by a reference method and by calculating the Student’s t-test and F-test values at 95% confidence level.
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<br/>Page(s): 74-78Kinetics of tween-80 micellar catalysed chloramine-T oxidation of vitamins in HClO₄ mediumhttp://nopr.niscair.res.in/handle/123456789/3221
Title: Kinetics of tween-80 micellar catalysed chloramine-T oxidation of vitamins in HClO₄ medium
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<br/>Authors: Shukla, Varuna; Upadhyay, Santosh K
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<br/>Abstract: A catalytic effect of non-ionic (tween-80) micelles on the rate of oxidation of thiaminehydrochloride (vitamin B₁) and pyridoxine hydrochloride (vitamin B₆) by sodium salt of p-toluene sulphonamide (chloramine-T) in acidic medium has been observed and rate has been found to be proportional to {k' + k" [Tween-80]}, where k' and k" are the rate constants in absence and in presence of surfactant, respectively. The rate showed a first order, a fractional order and a zero order dependence on [Chloramine-T]₀, [Vitamin]₀ and [H⁺]₀, respectively. The association/binding between the oxidant and the surfactant micelle is supported by the spectrophotometric evidence. A mechanism has been proposed and binding parameters have been evaluated.
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<br/>Page(s): 46-51Fatty acid triazoles derived from Neem, Rice bran and Karanja oils as corrosion inhibitors for mild steelhttp://nopr.niscair.res.in/handle/123456789/3220
Title: Fatty acid triazoles derived from Neem, Rice bran and Karanja oils as corrosion inhibitors for mild steel
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<br/>Authors: Toliwal, S D; Jadav, Kalpesh
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<br/>Abstract: 5-Alkyl-4 phenyl-4H-[1,2,4]triazole-3-thiol of phenyl hydrazides of fatty acids from Neem, Rice bran and Karanja oils have been synthesized and evaluated as corrosion inhibitors of mild steel (MS) in hydrochloric acid solutions by weight loss method. The adsorption of all the phenyl hydrazides derivatives on mild steel surface in the acid solution has been found to obey Langmuir’s adsorption isotherm. Inhibition efficiency of these compounds has been found to vary with concentration of the compound, solution temperature, immersion time and concentration of acid solution. The activation energies (Ea) have been calculated to investigate the mechanism of the corrosion inhibition. The inhibition efficiency increases with the increase in concentration of the inhibitors.
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<br/>Page(s): 32-37